uncmz - extractor for Lotus CMZ files

Probably a proprietary format by Lotus. These files are DCL imploded with some basic header.

Requires

To build:

• golang 1.16

To install binary release:

• See releases for builds for most major OS and architectures.

Usage

usage: uncmz [-h] -e FILENAME [-d PATH]

Extract Lotus CMZ Files.

optional arguments:
  -h, --help            show this help message and exit
  -e FILENAME, --extract FILENAME
                        The CMZ file to extract.
  -d PATH, --destination PATH
                        An optional output folder.

Please file bugs on the GitHub Issues. Thanks

Format Info

Reverse engineering of the format I found:

• 4 byte file signature: "Clay"
• 4 byte integer - Compressed data size
• 4 byte integer - Uncompressed data size
• 4 byte checksum - unknown checksum algorithm?
• 1 byte filename length
• 1 byte unknown, usually "\x00"
• 1 byte unknown but is sometimes 02, 10, 40 or 42. Possibly some bitfield.
• 1 byte unknown, usually "\x00"
• n bytes Filename
• remainder - DCL Imploded payload

A 010 Editor binary template covering the file format is included in this repo.

References

• Archive format information: http://fileformats.archiveteam.org/wiki/CMZ_(archive_format)
• Samples: http://cd.textfiles.com/cdaction/cdaction35/PROG/AMIPRO/

Author

• Kris Hunt (@ctfkris)